Transformer framework capable of increasing creepage distance and transformer
By designing grooves and concave walls on the transformer frame, the problem of increasing creepage distance was solved, achieving the effect of increasing creepage distance without increasing volume and cost, and reducing production difficulty and material cost.
Patent Information
- Application Number
- CN202520241587.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-14
AI Technical Summary
In existing technologies, increasing the creepage distance between the primary and secondary circuits of a transformer usually requires increasing the volume of the transformer frame and production costs, leading to increased production difficulty and higher costs.
By creating a groove extending in the second direction on the first base of the transformer frame, located between the first metal pin and the winding frame, and combining it with the design of concave walls and side walls, the creepage distance is increased without significantly increasing the frame volume, thus saving materials and production costs.
Without increasing transformer size and complex processes, the creepage distance between the primary and secondary circuits can be effectively increased, reducing production difficulty and material costs, and improving production efficiency.
Smart Images
Figure CN223757376U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field especially is related to a transformer skeleton of increasing creeping distance and transformer. BACKGROUND
[0002] In prior art, for increasing the creeping distance between primary side circuit and secondary side circuit, usually through increasing the base of transformer skeleton or wrapping the transformer core with paper, which greatly increases the volume of transformer and the cost of production and material. Therefore, it is urgent to provide a transformer skeleton of increasing creeping distance, which can meet the design requirement of safety distance between primary side circuit and secondary side circuit, and help to increase the creeping distance between primary side circuit and secondary side circuit. SUMMARY
[0003] Therefore, it is necessary to provide a transformer skeleton of increasing creeping distance, which can meet the design requirement of safety distance between primary side circuit and secondary side circuit, and help to increase the creeping distance between primary side circuit and secondary side circuit.
[0004] The application provides a transformer skeleton of increasing creeping distance, which comprises a first base, a bobbin and a second base connected along a first direction, a first metal pin is arranged on the end face of the first base away from the second base, a second metal pin is arranged on the end face of the second base away from the first base, a groove extending along a second direction and in strip shape is arranged on the top surface of the first base, the groove is located between the first metal pin and the bobbin, and the first direction is perpendicular to the second direction.
[0005] In the transformer skeleton of increasing creeping distance provided by the application, the first base is provided with the groove extending along the second direction, and the groove is located between the first metal pin and the second metal pin, which not only does not need to greatly increase the volume of transformer skeleton, but also is beneficial to save the cost of transformer production and material, realizes increasing the creeping distance between primary side circuit and secondary side circuit without increasing the volume of transformer skeleton and complicated process, and is beneficial to reduce the difficulty of transformer production and save material cost.
[0006] In an embodiment, the groove is a blind groove.
[0007] In an embodiment, the bobbin is provided with a receiving cavity penetrating through two sides opposite to each other along the first direction, and the receiving cavity is used for accommodating a magnetic core.
[0008] In an embodiment, the top surface of the first base is provided with a concave wall, the concave wall is located between the groove and the first metal pin along the first direction and faces the receiving cavity, and the concave wall extends along the second direction.
[0009] In one embodiment, the concave wall forms a gap away from an end edge of the first base, the gap being directly opposite the accommodating cavity in the first direction; the top surface of the first base is further provided with a side wall, the side wall being misaligned with the accommodating cavity in the first direction, the side wall being connected with the concave wall and extending in a direction close to the second base.
[0010] In one embodiment, the first base is provided with a first wire slot on a side away from the recess, the first wire slot extending from the first metal pin to the wire reel in the first direction; the second base is provided with a second wire slot on a side away from the recess, the second wire slot extending from the second metal pin to the wire reel in a reverse direction of the first direction.
[0011] In one embodiment, the wire reel is provided with a first baffle and a second baffle in the first direction, a wire winding space being formed between the first baffle and the second baffle.
[0012] In one embodiment, the first baffle and the second baffle are located on a side of the wire reel away from the first wire slot and the second wire slot.
[0013] In one embodiment, a distance between the first baffle and the first metal pin is greater than a distance between the second baffle and the second metal pin.
[0014] A transformer, comprising a magnetic core, a first wire, a second wire and the transformer skeleton for increasing the creepage distance as described above, the magnetic core being arranged in the wire reel, the first wire being connected with the first metal pin and winding around the wire reel, the second wire being connected with the second metal pin and winding around the wire reel. BRIEF DESCRIPTION OF DRAWINGS
[0015] The utility model will be further explained in connection with the drawings and embodiments, in which:
[0016] Fig. 1 The structure schematic view of the transformer skeleton for increasing the creepage distance provided by an embodiment of the present application;
[0017] Fig. 2 The structure schematic view of the transformer skeleton for increasing the creepage distance provided by an embodiment of the present application;
[0018] Fig. 3 The structure schematic view of the transformer skeleton for increasing the creepage distance provided by an embodiment of the present application.
[0019] Reference signs: transformer skeleton 10 for increasing creepage distance; first base 20; first metal pin 21; groove 22; concave wall 23; notch 231; first winding slot 24; side wall 25; winding frame 30; accommodating cavity 31; first baffle 32; second baffle 33; second base 40; second metal pin 41; second winding slot 42; first direction P1; second direction P2 DETAILED DESCRIPTION
[0020] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit of the present application, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.
[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0022] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0023] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0024] In today's switching power supply products, for the open board type small size switching power supply, in order to meet the design requirements of the primary circuit and the secondary circuit of the power supply, it is necessary to increase the creepage distance between the primary circuit and the secondary circuit, the secondary circuit and the secondary circuit. The traditional method is to directly increase the interval distance between the conductive parts of the primary circuit and the secondary circuit, and the secondary circuit and the secondary circuit, which directly increases the overall size of the transformer skeleton. In order to increase the creepage distance of the conductive parts between the primary circuit and the secondary circuit, the secondary circuit and the secondary circuit, the general method is to greatly increase the size of the first base or the second base, or to use the flying line method (using a longer three-layer insulating wire through the metal pin and the wire slot to be directly used as the secondary circuit wire), or to wrap the magnetic core, winding and skeleton assembly with insulating tape. Due to the large increase in the size of the first base and the second base, the structure of the circuit board needs to be changed, the use of flying wire insulating tape will bring certain cost, and additional processes such as soldering wire, wrapping insulating tape, etc. have a certain impact on the reliability of the product, while increasing the production cost of the transformer; Even due to the uncontrollability of part of the process precision, it brings a certain production failure rate, which seriously affects the production benefit. At the same time, in order to prevent the primary and secondary wires from contacting each other, it is usually necessary to increase the retaining wall, sleeve, reverse folding paper, etc. at the wire collecting place, which needs to be operated manually, affecting the automatic production of the transformer, increasing the additional process and cost.
[0025] In the existing switching power supply products, the small transformer used in the micro power supply module needs to increase the creepage distance between the primary circuit and the secondary circuit in order to meet the design requirements of the safety distance between the primary circuit and the secondary circuit. Change the transformer skeleton so that it can meet the safety distance requirements of the transformer. In the prior art, in order to increase the creepage distance between the primary circuit and the secondary circuit, the base of the transformer skeleton is usually widened or the magnetic core of the transformer is wrapped with paper, which greatly increases the volume of the transformer and the production and material cost. Therefore, a transformer skeleton for increasing the creepage distance is needed, which can meet the design requirements of the safety distance between the primary circuit and the secondary circuit, and help to increase the creepage distance between the primary circuit and the secondary circuit.
[0026] Reference Figs. 1-3To solve the above problems, the embodiment of the present application provides a transformer skeleton 10 capable of increasing the creepage distance, which comprises a first base 20, a bobbin 30 and a second base 40 connected along a first direction P1, a first metal pin 21 is arranged on the end face of the first base 20 away from the second base 40, a second metal pin 41 is arranged on the end of the second base 40 away from the first base 20, a groove 22 extending along a second direction P2 and in a strip shape is arranged on the top surface of the first base 20, the groove 22 is located between the first metal pin 21 and the bobbin 30, and the first direction P1 is perpendicular to the second direction P2.
[0027] Reference Figs. 1-3 In the transformer skeleton 10 capable of increasing the creepage distance, Fig. 1 、 Fig. 2 and Fig. 3 The structure diagram of the transformer skeleton 10 capable of increasing the creepage distance provided by the embodiment of the present application is shown. The transformer skeleton 10 capable of increasing the creepage distance comprises a first base 20, a bobbin 30 and a second base 40 connected along a first direction P1, the first base 20 and the second base 40 can play a supporting role, the bobbin 30 is connected with the first base 20 and the second base 40, the transformer skeleton 10 capable of increasing the creepage distance is a main structural component of the transformer and is also called a transformer bobbin. It provides a winding space for the copper wire in the transformer, fixes the magnetic core in the transformer, and provides a path for the wire and the conduction. The transformer skeleton 10 capable of increasing the creepage distance can provide a winding space for the copper wire, the winding groove on the skeleton is used for winding the copper wire, ensuring the stability and neatness of the coil, the bobbin 30 is a part in the transformer skeleton for fixing and guiding the winding of the copper wire, and the bobbin 30 provides a winding space for the copper wire in the transformer, ensuring that the copper wire can be stably wound on the transformer skeleton 10 capable of increasing the creepage distance.
[0028] Reference Fig. 1 and Fig. 2 The bobbin 30 is formed with a receiving cavity 31 penetrating through the two sides opposite to the first direction P1, and the receiving cavity 31 is used for accommodating the magnetic core of the transformer. The skeleton fixes the magnetic core through the receiving cavity 31, ensuring the stability of the position of the magnetic core in the transformer. The shape of the receiving cavity 31 can be determined according to the matched magnetic core, such as a round hole, a square hole or a special-shaped hole.
[0029] In some embodiments, the first base 20 is provided with a first metal pin 21 at one end surface away from the second base 40, and the second base 40 is provided with a second metal pin 41 at one end surface away from the first base 20. The first metal pin 21 and the second metal pin 41 are some protrusions on the transformer skeleton, mainly used for connecting the coil and the external circuit. The first metal pin 21 and the second metal pin 41 play a crucial role in the manufacturing process of the transformer, and can ensure the reliability and performance of the transformer. For example, the first metal pin 21 and the second metal pin 41 are connected to the printed circuit board by welding, and play a conductive role, ensuring that the current inside the transformer can be smoothly transmitted to the external circuit. Common types of pins include vertical and horizontal pins, straight and curved pins. Vertical and horizontal pins are mainly used for soldering on the circuit board, straight pins are suitable for straight insertion electronic components, and curved pins are suitable for insertion electronic components. According to actual needs, metal pins of different materials can be used, for example, pure copper pins have good conductivity, high strength, and good corrosion resistance, but the price is relatively high, silver-plated pins have good conductivity and corrosion resistance, the price is relatively cheap, but the strength is slightly lower, gold-plated pins not only have good conductivity and corrosion resistance, but also have good ornamental properties, but the price is relatively high and easy to oxidize and fall off.
[0030] The first base 20 is provided with a groove 22 extending along the second direction P2. The groove is a blind groove, and the groove 22 is located between the first metal pin 21 and the second metal pin 41. The first direction P1 is perpendicular to the second direction P2. The design of the groove 22 not only does not need to greatly increase the volume of the transformer skeleton, but also is conducive to saving the cost of transformer production and materials, and at the same time can meet the design requirements of the safety distance between the primary circuit and the secondary circuit of the power supply, and help to increase the creepage distance between the primary circuit and the secondary circuit.
[0031] The first base 20 is provided with a concave wall 23 located on one side of the first base 20 provided with the groove 22, and the concave wall 23 is located on the side of the groove 22 away from the second base 40. The concave wall 23 extends along the second direction P2, and the combination of the concave wall 23 and the groove 22 can increase the creepage distance between the primary side circuit and the secondary side circuit. In some embodiments, the first base 20 is provided with a side wall 25 connected with the concave wall 23 and extending in the direction close to the second base 40. For example, the left side of the first base 20 is provided with the side wall 25, and by setting the connected concave wall 23 and side wall 25, a two-sided surrounding valley structure is formed, so that the primary side magnetic core can be separated from the first metal pin 21 embedding surface of the first base 20 and the conductive parts of the secondary side circuit in the height direction of the two sides. The concave wall 23 and the side wall 25 have a certain thickness, which is arranged at the edge of the first base 20 and flush with the outer edge of the first base 20. The concave wall 23 is parallel to the first baffle 32, and the side wall 25 is perpendicular to the first baffle 32. In some embodiments, in order to facilitate automatic assembly of the magnetic core, the height of the concave wall 23 is 1.25 mm.
[0032] In some embodiments, the concave wall 23 is provided with a notch 231 at the edge away from the first base 20, and the notch 231 faces the accommodating cavity 31 along the first direction P1. The notch 231 can be rectangular, or can be a quadrilateral with smooth edges. The notch 231 on the concave wall 23 can effectively meet the requirements of safety design and serve as a primary and secondary side foolproof mark of the magnetic core. In order to cope with the situation that the conductive parts of the secondary side circuit exist on the lower side of the transformer, and to ensure that the creepage distance between the conductive parts of the secondary side circuit and the conductive parts of the primary side circuit of the transformer meets the safety requirements, the height of the side wall 25 is equal to the height of the first baffle 32, and the side wall 25 also serves as a support for the lower side of the transformer.
[0033] In some embodiments, the right side of the first base 20 is provided with a second groove penetrating the upper and lower surfaces of the first base 20. By setting the second groove, the creepage distance between the conductive parts of the primary side circuit or the secondary side circuit of the transformer, or between the conductive parts of the primary side circuit or the secondary side circuit of the transformer and the conductive parts of the isolation circuit, can be effectively increased. For the case of simultaneously increasing the creepage distance between the conductive parts of the primary side circuit and the conductive parts of the secondary side circuit of the transformer, the second groove, the side wall 25 and the concave wall 23 can be simultaneously set on the upper surfaces of the first base 20 and the second base 40. The number and position of the second groove, the side wall 25 and the concave wall 23 can also be changed according to actual application conditions.
[0034] Reference Figs. 1-3The bobbin 30 is provided with a first baffle 32 and a second baffle 33 at intervals in the first direction P1, and a winding space is formed between the first baffle 32 and the second baffle 33. The first baffle 32 and the second baffle 33 extend outwardly at both ends of the bobbin 30, and the distance between the first baffle 32 and the first metal pin 21 is greater than the distance between the second baffle 33 and the second metal pin 41. The edges of the first baffle 32 and the second baffle 33 on the side away from the first base 20 and the second base 40 are smooth edges, and the top of the first baffle 32 and the second baffle 33 is ground flat, which can reduce the foolproof effect and prevent the core from being installed into the card core without the need for an outwardly extended platform, thereby effectively improving the production cost and efficiency of the transformer. The main materials of the transformer skeleton include bakelite, nylon and liquid crystal polymer. These materials have good mechanical strength, insulation, heat resistance and corrosion resistance, which can meet the needs of the transformer in different working environments. The first baffle 32 and the second baffle 33 can be made of bakelite, which is one of the most commonly used materials in transformer skeletons and has high mechanical strength, good insulation, heat resistance and corrosion resistance. Bakelite is generally black and has a smooth surface, and is particularly resistant to high temperatures. In addition, the first baffle 32 and the second baffle 33 can also be made of nylon, which is a thermoplastic resin with strong toughness, good ductility and not easy to break. The nylon skeleton is usually white and transparent, has a certain water absorption, is resistant to oil, but melts easily when heated, and the winding is easy to deform. The nylon skeleton can be used to make low-frequency transformers or ordinary coil inductors with low winding requirements. The first baffle 32 and the second baffle 33 can also be made of liquid crystal polymer, which has excellent electrical and mechanical properties.
[0035] The first base 20 is provided with a first winding groove 24 on the side away from the groove 22, and the first winding groove 24 extends from the first metal pin 21 to the bobbin 30 in the first direction P1. The first winding groove 24 can wind copper wire and provide space for winding copper wire in the transformer. Similarly, the second base 40 is provided with a second winding groove 42 on the side away from the groove 22, and the second winding groove 42 extends from the second metal pin 41 to the bobbin 30 in the opposite direction of the first direction P1. The second winding groove 42 can wind copper wire and provide space for winding copper wire in the transformer. To ensure the normal use of the first winding groove 24 and the second winding groove 42, the width of the first winding groove 24 and the second winding groove 42 can be as large as possible within the tolerance range during design and manufacturing. This can avoid the situation that the customer cannot wind the wire, and it is easier to change the size of the insert on the mold. Conversely, the effect is poor. In order to avoid scratching the copper wire when the customer winds the wire, the edges of the first winding groove 24 and the second winding groove 42 should be rounded to increase the strength and prevent the skeleton from being broken. In order to ensure the strength and durability of the transformer skeleton 10 with increased creepage distance, the first winding groove 24 or the second winding groove 42 can be made on an insert.
[0036] Specifically, a plurality of adjacent and parallel first winding grooves 24 can be provided on the first base 20, and a plurality of adjacent and parallel second winding grooves 42 can be provided on the second base 40, and the groove walls of the first winding grooves 24 and the second winding grooves 42 can be provided as plates with slopes. At the same time, adjacent groove walls can be provided with different thicknesses as needed to meet the output interval safety requirements, and to reduce material and labor costs, improve reliability and consistency, and improve production efficiency. After the transformer is wound, the three-layer insulated wire is directly wound on the plurality of spaced and parallel first metal pins 21 and second metal pins 41, and is welded together, without three-layer insulated wire flying wire processing, which can reduce the process difficulty and enhance the welding reliability.
[0037] The transformer of the second aspect embodiment of the utility model, including magnetic core, first wire, second wire and the transformer framework 10 of increasing creeping distance of first aspect embodiment, magnetic core is located in the winding frame 30, first wire's connection first metal pin 21 and winding winding frame 30, second wire connection second metal pin 41 and winding winding frame 30. Since the embodiment adopts all the technical features of the transformer framework 10 of increasing creeping distance of the first aspect embodiment, the embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be described here.
[0038] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.
[0039] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, some modifications and improvements can be made, which are all within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.
Claims
1. A transformer frame for increasing creepage distance, characterized in that, The device includes a first base, a winding frame, and a second base connected along a first direction. The end face of the first base away from the second base is provided with a first metal pin, and the end face of the second base away from the first base is provided with a second metal pin. The top surface of the first base is provided with a groove extending along a second direction and in the shape of a strip. The groove is located between the first metal pin and the winding frame. The first direction is perpendicular to the second direction.
2. The transformer frame for increasing creepage distance according to claim 1, characterized in that, The groove is a blind groove.
3. The transformer frame for increasing creepage distance according to claim 1, characterized in that, The winding frame forms a receiving cavity that extends through both opposite sides of the first direction, and the receiving cavity is used to receive the magnetic core.
4. The transformer frame for increasing creepage distance according to claim 3, characterized in that, The top surface of the first base has a concave wall protruding from it. The concave wall is located between the groove and the first metal pin in the first direction and is directly opposite the receiving cavity. The concave wall extends along the second direction.
5. The transformer frame for increasing creepage distance according to claim 4, characterized in that, The concave wall has a notch at one end away from the first base, and the notch is directly opposite the receiving cavity along the first direction; the top surface of the first base is also provided with a side wall, which is offset from the receiving cavity in the first direction, and the side wall is connected to the concave wall and extends along the direction close to the second base.
6. The transformer frame for increasing creepage distance according to claim 3, characterized in that, The first base has a first winding groove on the side opposite to the groove, and the first winding groove extends from the first metal pin along the first direction to the winding frame; the second base has a second winding groove on the side opposite to the groove, and the second winding groove extends from the second metal pin in the opposite direction along the first direction to the winding frame.
7. The transformer frame for increasing creepage distance according to claim 6, characterized in that, The winding frame is provided with a first baffle and a second baffle at intervals in the first direction, and a winding space is formed between the first baffle and the second baffle.
8. The transformer frame for increasing creepage distance according to claim 7, characterized in that, The first baffle and the second baffle are located on the side of the winding frame opposite to the first winding groove and the second winding groove.
9. The transformer frame for increasing creepage distance according to claim 7, characterized in that, The distance between the first baffle and the first metal pin is greater than the distance between the second baffle and the second metal pin.
10. A transformer, characterized in that, The transformer includes a magnetic core, a first conductor, a second conductor, and a transformer frame for increasing creepage distance as described in any one of claims 1 to 9. The magnetic core is disposed in a winding frame, the first conductor is connected to the first metal pin and wound around the winding frame, and the second conductor is connected to the second metal pin and wound around the winding frame.